We started around 2 months. I had read a little about EC & got a BBLP when I was pregnant. DD hates to be wet so we were doing like 30 diaper changes a day. I started putting her on the potty at each diaper change and every time she woke up. DD seemed to like it mostly (at least more than she liked a wet dipe ) and we were using way fewer diapers. Then she started waking me up at night to pee & there was not turning back.